<template>
    <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 警告区域 -->
        <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false"></el-alert>

        <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="selectedCateKeys" @change="handleChange"></el-cascader>
            </el-col>
        </el-row>

        <!-- tab 页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
            <!-- 添加参数的按钮 -->
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
            <!-- 动态参数表格 -->
            <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
                <el-table-column type="expand"></el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
            <!-- 添加属性的按钮 -->
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
            <!-- 静态属性表格 -->
            <el-table :data="onlyTableData" border stripe>
                <!-- 展开行 -->
                <el-table-column type="expand"></el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                </el-table-column>
            </el-table>
            </el-tab-pane>
        </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
        <!-- 添加参数的对话框 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
        <!-- 添加参数的对话框 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
        // 商品分类列表
        catelist: [],
        // 级联选择框的配置对象
        cateProps: {
            value: 'cat_id',
            label: 'cat_name',
            children: 'children'
        },
        // 级联选择框双向绑定到的数组
        selectedCateKeys: [],
        // 被激活的页签的名称
        activeName: 'many',
        // 动态参数的数据
        manyTableData: [],
        // 静态属性的数据
        onlyTableData: [],
        // 控制添加对话框的显示与隐藏
        addDialogVisible: false,
        // 添加参数的表单数据对象
        addForm: {
            attr_name: ''
        },
        // 添加表单的验证规则对象
        addFormRules: {
            attr_name: [
            { required: true, message: '请输入参数名称', trigger: 'blur' }
            ]
        },
        // 控制修改对话框的显示与隐藏
        editDialogVisible: false,
        // 修改的表单数据对象
        editForm: {},
        // 修改表单的验证规则对象
        editFormRules: {
            attr_name: [
            { required: true, message: '请输入参数名称', trigger: 'blur' }
            ]
        }
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有的商品分类列表
        async getCateList() {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
            return this.$message.error('获取商品分类失败！')
        }

        this.catelist = res.data

        console.log(this.catelist)
        },
        // 级联选择框选中项变化，会触发这个函数
        handleChange() {
        this.getParamsData()
        },
        // tab 页签点击事件的处理函数
        handleTabClick() {
        console.log(this.activeName)
        this.getParamsData()
        },
        // 获取参数的列表数据
        async getParamsData() {
        // 证明选中的不是三级分类
        if (this.selectedCateKeys.length !== 3) {
            this.selectedCateKeys = []
            return
        }

        // 证明选中的是三级分类
        console.log(this.selectedCateKeys)
        // 根据所选分类的Id，和当前所处的面板，获取对应的参数
        const { data: res } = await this.$http.get(
            `categories/${this.cateId}/attributes`,
            {
            params: { sel: this.activeName }
            }
        )

        if (res.meta.status !== 200) {
            return this.$message.error('获取参数列表失败！')
        }

        console.log(res.data)
        if (this.activeName === 'many') {
            this.manyTableData = res.data
        } else {
            this.onlyTableData = res.data
        }
        },
        // 监听添加对话框的关闭事件
        addDialogClosed() {
        this.$refs.addFormRef.resetFields()
        },
        // 点击按钮，添加参数
        addParams() {
        this.$refs.addFormRef.validate(async valid => {
            if (!valid) return
            const { data: res } = await this.$http.post(
            `categories/${this.cateId}/attributes`,
            {
                attr_name: this.addForm.attr_name,
                attr_sel: this.activeName
            }
            )

            if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败！')
            }

            this.$message.success('添加参数成功！')
            this.addDialogVisible = false
            this.getParamsData()
        })
        },
        // 点击按钮，展示修改的对话框
        async showEditDialog(attr_id) {
        // 查询当前参数的信息
        const { data: res } = await this.$http.get(
            `categories/${this.cateId}/attributes/${attr_id}`,
            {
            params: { attr_sel: this.activeName }
            }
        )

        if (res.meta.status !== 200) {
            return this.$message.error('获取参数信息失败！')
        }

        this.editForm = res.data
        this.editDialogVisible = true
        },
        // 重置修改的表单
        editDialogClosed() {
        this.$refs.editFormRef.resetFields()
        },
        // 点击按钮，修改参数信息
        editParams() {
        this.$refs.editFormRef.validate(async valid => {
            if (!valid) return
            const { data: res } = await this.$http.put(
            `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
            { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
            )

            if (res.meta.status !== 200) {
            return this.$message.error('修改参数失败！')
            }

            this.$message.success('修改参数成功！')
            this.getParamsData()
            this.editDialogVisible = false
        })
        },
        // 根据Id删除对应的参数项
        async removeParams(attr_id) {
        const confirmResult = await this.$confirm(
            '此操作将永久删除该参数, 是否继续?',
            '提示',
            {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }
        ).catch(err => err)

        // 用户取消了删除的操作
        if (confirmResult !== 'confirm') {
            return this.$message.info('已取消删除！')
        }

        // 删除的业务逻辑
        const { data: res } = await this.$http.delete(
            `categories/${this.cateId}/attributes/${attr_id}`
        )

        if (res.meta.status !== 200) {
            return this.$message.error('删除参数失败！')
        }

        this.$message.success('删除参数成功！')
        this.getParamsData()
        }
    },
    computed: {
        // 如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled() {
        if (this.selectedCateKeys.length !== 3) {
            return true
        }
        return false
        },
        // 当前选中的三级分类的Id
        cateId() {
        if (this.selectedCateKeys.length === 3) {
            return this.selectedCateKeys[2]
        }
        return null
        },
        // 动态计算标题的文本
        titleText() {
        if (this.activeName === 'many') {
            return '动态参数'
        }
        return '静态属性'
        }
    }
    }
</script>

<style lang="less" scoped>
.cat_opt {
    margin: 15px 0;
}
</style>
